uni/mmme/2xxx/2047_thermodynamics_and_fluid_dynamics/dimensional_analysis.md

@@ -120,44 +120,4 @@ where $M$, $L$, and $T$ are units of mass, length, and time respectively.
 The two equations results in some simple simultaneous equations to solve to find the
 coefficients $a$, $b$, $c$, $d$, $e$, $f$.
 
-# Standard Nondimensional Groups in Fluids
-
-This is not an exhaustive list.
-
-## Reynolds Number
-
-$$\text{Re} = \frac{\rho U L}{\mu}$$
-
-Represents ratio of intertial forces over viscous forces.
-Important in all viscous flows.
-
-## Froude Number
-
-$$\text{Fr} = \frac{U^2}{gL}$$
-
-Represents ratio of inerital forces over gravitational forces.
-Important in flows with interfaces (e.g. gas-liquid).
-
-## Weber Number
-
-$$\text{We} = \frac{rho U^2 L}{\sigma}$$
-
-where $\sigma$ is the surface tension coeffecient.
-
-Represents ratio of inertial to capillary forces.
-Important to flows with strong surface tension effects (e.g. droplets,
-bubbles, jets)
-
-## Strouhal Number
-
-$$\text{St} = \frac{fL}{U}$$
-
-where $f$ is frequency.
-
-Important in flows with velocity oscillations.
-
-## Mach Number
-
-$$\text{Ma} = \frac U a$$
-
 

uni/mmme/2xxx/2051_electromechanical_devices/fundamentals.md

@@ -1,86 +0,0 @@
----
-author: Akbar Rahman
-date: \today
-title: MMME2051 // Electrical Engineering Fundamentals
-tags: [ mmme2051 ]
-uuid: 412c8cb8-ec0c-4d6f-b899-f1296f4fc639
----
-
-# Across Variable vs Through Variable
-
-Across variables:
-
-- Appears across two terminal of an element
-- Measured relative to a reference point
-- e.g. voltage
-
-Through variables:
-
-- Value is same at both terminals of an element
-- e.g. current
-
-# Ohm's Law
-
-For all components that follow Ohm's law:
-
-$$V = IR$$
-
-where $V$ is voltage across a component, $I$ is current through it, and $R$ is resistance of the component.
-
-# Impedance vs Resistance
-
-- Impedance is used when there are energy storage elements to a component.
-- Resistance, a special case of impedance, can be used when there is no storage element
-
-# Kirchhoff's Laws
-
-## Current
-
-The sum of current entering a node is 0
-
-$$\sum_n I_n = 0$$
-
-## Voltage
-
-The sum of voltage around a closed loop is 0
-
-$$\sum_n V_n = 0$$
-
-# Energy Storing Elements --- Reactive Elements
-
-When you apply a voltage to a reactive element, the reactive element will start storing energy.
-When the voltage is removed, it will push current until all energy is dissipated.
-
-There are two types of Reactive Elements
-
-## Inductors
-
-A coil of wire wound around a magnetic core, such as iron.
-
-They have a property, inductance, with SI unit henry and symbol H.
-
-For an inductor:
-
-$$V = L\frac{\mathrm{d}I}{\mathrm{d}t}$$
-
-where $L$ is the inductance of the coil.
-
-Energy is stored in the magnetic flux around the coil.
-
-This creates the behaviour of trying to minimize change in current.
-
-If you remove the voltage source and open the circuit, the inductor would have a voltage approaching
-infinity, causing problems if the energy stored in the inductor is high enough.
-
-## Capacitor
-
-For a capacitor:
-
-$$I = C\frac{\mathrm{d}V}{\mathrm{d}t}$$
-
-Energy is stored in the form of electrostatic attraction in the adjacent plates.
-
-Capacitors try to minimize changes in voltage.
-
-If a capacitor is shorted, the current through the connecting wires will be extremely high, causing
-the wires to heat up.